dir_index
is a hashed b-tree implementation for ext3, it's riskfree (Fedora has
shipped several releases defaulting to it without incident), and adds a
bit of performance to your filesystem.
to update an existing partitions:
0) open a terminal or enter cli
1) sudo tune2fs -O dir_index /dev/hdXY (where X indicates device, normally a and Y indicates partition, normally 1)
2a) sudo updatedb
alternatively, unmount and do
2b) sudo e2fsck -D /dev/hdXY
Original post:
http://ubuntuforums.org/showthread.php?t=37806
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